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G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
G01N27/403—Cells and electrode assemblies
G01N27/406—Cells and probes with solid electrolytes
G01N27/407—Cells and probes with solid electrolytes for investigating or analysing gases
G01N27/4075—Composition or fabrication of the electrodes and coatings thereon, e.g. catalysts
G01N27/4076—Reference electrodes or reference mixtures